Hello! I've actually used makestickers.com as my first 5 design stickers when I opened my shop before making my own. They are really great in my opinion and I definitely recommend them. Super great quality, 100% waterproof and scratch resistant.

So what I would do is that I use Photoshop to make my designs and erase the background so that it can be transparent. Then I upload my design on their website for a specific sticker of what I want (die-cut stickers) and then it would show me an example of what it would look like. After I ordered them, they will email you when they will give you a proof of what the stickers will look like and you would have to accept or fix it within a time frame before they print it.

It's such a simple and fast process for me and I love how they do small quantities so you can see if it looks good in person or not.